科学与数学qntm.org
如何毁灭地球（2006）
How to Destroy the Earth (2006)
2010 — 2021，它一次次回到首页
黑点是上首页（≥ 50 分）的那次投稿，空心点是没冲上去的投稿，点越大分数越高。
导读
这是 qntm 的经典科普式幽默文章，系统列举各种“毁灭地球”的方案——从拆解行星、制造黑洞到更荒诞的办法——并认真评估它们的物理可行性和所需条件。它表面像末日指南，实际是一场关于极端假设的科学娱乐。
为什么经久不衰：它把疯狂的末日设想变成严谨又好笑的物理思想实验，跨越多年仍能引发关于能量、引力和生命极限的讨论。
HN 评论精选
钴弹理论上可毁灭地球生命，但从未被实际建造。
我们其实已有技术用一件东西毁灭地球生命：钴弹。它是一种“加盐”核弹，设计为把巨量放射性钴抛入大气层；好比数百个切尔诺贝利核电站同时在空中爆炸，尘埃绕地球落下，在几年内慢慢杀死所有人和植物，生态系统被摧毁，地球在一段时间内不宜居。幸运的是我们决定氢弹和中子弹已经够坏，钴弹留在了绘图板上。
qbasic_forever查看英文原文
We actually have the technology to destroy life on the planet with one thing, the cobalt bomb: https://en.wikipedia.org/wiki/Cobalt_bomb It's a salted nuclear bomb made to throw an enormous cloud of radioactive cobalt into the atmosphere of a planet. It would be as if hundreds of Chernobyl powerplants exploded in the air and the fallout would circle the globe, fall on all the people and plants and slowly kill them over a few years. The ecosystem would be devastated and the planet would become unlivable for some time. Luckily we decided hydrogen and neutron bombs were about as bad a device as we wanted to build and left cobalt bombs on the drawing board.
补充一种荒诞方法：不断给地球增加质量也能“毁灭”它。
我没看到这一种：行星肥胖致死。与精心拆解地球相反，不断把更多质量带到地球——纪念品、访客、进口货、海量贵金属——什么都行，只要一直囤积。最终地球要么改变轨道坠入太阳，要么自己变成太阳，要么变成黑洞。
jl6查看英文原文
I didn’t see this one: Death by planetary obesity. Kind of the opposite of meticulously deconstructing the planet, instead bring more and more mass to Earth - souvenirs, visitors, imports, a few hundred trillion quadrillion kilograms of precious metals... doesn’t matter what, just keep hoarding more and more stuff. Eventually Earth will either change orbit and sink into the sun, or it will become a sun itself, or it will become a black hole.
小黑洞未必危险，因为引力是四种基本作用力中最弱的。
值得注意的一点是，足够小的黑洞基本上无害。显然存在一个临界点，黑洞会变得危险——但值得记住，引力是主要作用力中最弱的。有物理极客愿意算算珠峰大小的黑洞吃掉地球要多久吗？
joe_the_user查看英文原文
One point of note is that is that a small-enough black hole would be essentially harmless. See http://www.aip.org/pnu/2008/split/871-1.html Obviously, there is a tipping point where a black hole becomes dangerous - but it's worth remembering that gravity is the weakest of the major forces. Any physics geeks care to calculate how long it would take an Everest-sized black hole to eat the earth?
消灭所有生命比拆解地球更难，水熊虫等极端生命是巨大障碍。
这里有些评论说“毁灭世界”通常指毁灭地球生命。顺着这个思路，我想说，杀死目前距地心6500公里内所有生命，某些方面比单纯毁灭地球更难。比如卑微的水熊虫，能耐受接近绝对零度的冷冻，在硬真空中存活10天并产卵孵化。各种“拆解地球”方法很可能杀不死它们；任何带封闭生态系统的地球碎块也可能延续。要杀死一切，可能需要把行星蒸发进太阳或用黑洞吃掉。
Avshalom查看英文原文
There are a couple of comments here about the phrase "destroy the world" normally referring to life on earth. In that vein I'd like to say that killing all life currently within 6500 kilometers of the Earth's center of mass is, in some ways, harder than simply destroying the Earth. Take for instance the humble Water Bear they range from microscopic to a millimeter in size and can survive being frozen to within a degree of 0k and have survived 10 days in hard vacuum, during which time eggs were laid and hatched. It seems likely that any of the various "disassemble Earth" methods would fail to kill them. Similarly any chunk of Earth with a sealed ecosystem, like some caves, might continue to keep going indefinitely. Killing everything might require vaporizing the planet in the sun or eating it with a black hole.
历次讨论
同类还值得读
如果月球只有 1 像素：一个极其精确的太阳系模型（2014）
If the moon were only 1 pixel: A tediously accurate solar system model (2014)
一个网页版太阳系模型，以“如果月亮只有 1 像素”的真实比例呈现：你必须一路横向滚动，才能体会行星之间空旷到何等程度。
科学与数学上首页 7 次 · 2014–2025joshworth.com编辑精选沉浸式线性代数（2016）
Immersive Linear Algebra (2016)
《Immersive Linear Algebra》是一本完全免费、开放在线的线性代数“超文本教科书”，其最大特色是大量可交互的图形：读者可以直接拖动、操作图中的向量、矩阵和变换…
科学与数学上首页 5 次 · 2015–2024immersivemath.com编辑精选如何将贝果切成两个相连的半环（2009）
How to Slice a Bagel into Two Linked Halves (2009)
数学家 George Hart 的经典教程，演示如何用一刀把贝果切成两个相互扣住的环，并附上切割步骤与数学原理。
科学与数学上首页 5 次 · 2009–2022georgehart.com“犹太问题”：一组用于歧视的数学题
Jewish problems
一篇 arXiv 论文，整理并讨论苏联时期犹太学生在申请大学数学系时被问到的特殊数学难题：这些题往往有简单解法却极难想到，被用作面试中拒绝犹太考生的手段。
科学与数学上首页 5 次 · 2011–2021arxiv.org你的身体并非为长久而造：人类死亡率数据的一课
Your body wasn’t built to last: a lesson from human mortality rates
文章从人类死亡率随年龄变化的统计规律出发，解释身体并非为长久使用而设计：年轻时死亡风险较低，之后随年龄近似指数上升，像复杂系统在不断累积损伤。
科学与数学上首页 5 次 · 2009–2018gravityandlevity.wordpress.com